If the volume of the sealed balloon is decreased, then it is because of a decrease in the temperature. Thus, option b is correct.
The volume of the gas and the temperature show a direct relationship in accordance with the ideal gas equation. The increase or decrease in volume is directly affected by the temperature.
When the balloon is sealed no new volume of the oxygen or helium gas can be added nor the decrease in pressure will decrease the volume. But a decrease in temperature will decrease in volume as,
V ∝ T
Therefore, option B. decreases the temperature decreases the volume.
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